lateinit property songurl has not been initialized although I did

Question

I have two activities first one has public String var called songurl and button leads to the second activity and second activity has mediaplayer receive URL from the String var which is in the first activity and then start playing but the problem is the mediaplayer doesn't work and I got an error

here is MainActivity1.kt or .java as your language :-

  lateinit var songurl :String
class MainActivity1 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    songurl = "https//...... My URL"

        var btnstart_MainActivity2:Button = findViewById(R.id.btn)
        btnstart_MainActivity2.setOnClickListener {
            startActivity(Intent(this,Main2Activity::class.java))
        }

    }
}

here is MainActivity2 :-

class Main2Activity : AppCompatActivity() {
    lateinit var mediaplayer: MediaPlayer
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            mediaplayer= MediaPlayer()
            mediaplayer.setDataSource(songurl)
            mediaplayer.prepare()
            mediaplayer.start()
        }
    }

and here is the err
lateinit property songurl has not been initialized

show code how you pass `songurl` from one activity into another — Maksym V., Oct 02 '18 at 11:44
It's already in above code songurl = "https//...... My URL" @MaxAves — Mohamed Mohamed, Oct 02 '18 at 11:45
You can not access variable of your `MainActivity1` inside `Main2Activity` — AskNilesh, Oct 02 '18 at 11:47

Maksym V. · Answer 1 · 2018-10-02T11:50:32.377

0

Your problem is that your songurl is being present only in your first activity. There is no value and even assignment for it in activity 2.

Consider passing it as a intent's bundle parameter:

Activity1:
Bundle bundle= new Bundle();
bundle.putString("key", songurl);

Intent i = new Intent(Activity1.this,Activity2.class);
i.putExtras(bundle);
startActivity(i);

Activity2:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_another_activity);

    Bundle p = getIntent().getExtras();
    String songurl = p.getString("key");

}

Examples are in java.

edited Oct 02 '18 at 11:50

answered Oct 02 '18 at 11:48

Maksym V.

2,877
17
27

I did it and I got an err Caused by: java.lang.NullPointerException – Mohamed Mohamed Oct 02 '18 at 12:02
Than u must missed something, error occurred when you being getting argument? Than check new Intent creation, if u did pass you `songurl` with the same key as you where reading it. – Maksym V. Oct 02 '18 at 12:04
see my answer its in kotlin and it does check first if it contains that key – Zubair Soomro Oct 02 '18 at 12:08

Zubair Soomro · Accepted Answer · 2018-10-02T12:07:36.070

0

You should send your songUrl in android Intent extras. The reason you are getting error is that it isn't defined in the activity2 you have defined it in activity1.

to send intent extra

var intent = Intent(this,Main2Activity::class.java)
intent.putExtra("songurl", songurl)

to get extra in other activity

if(getIntent().hasExtra("songurl"){
 var songurl = getIntent().getStringExtra("songurl")
}

edited Oct 02 '18 at 12:07

answered Oct 02 '18 at 11:51

Zubair Soomro

180
1
12

lateinit property songurl has not been initialized although I did

2 Answers2